[SPARK-9667][SQL] followup: Use GenerateUnsafeProjection.canSupport to test Exchange supported data types.

This way we recursively test the data types.

cc chenghao-intel

Author: Reynold Xin <rxin@databricks.com>

Closes #8036 from rxin/cansupport and squashes the following commits:

f7302ff [Reynold Xin] Can GenerateUnsafeProjection.canSupport to test Exchange supported data types.